There should be a threaded linkage adjustment to alter the length of the rod from the steering column to the transmission, and/or a sliding clamp at the shifter arm where the linkage attaches. The problem with a conversion involves the fact that there are different crossmembers, driveshaft lengths, carburetor, throttle linkage, bellhousing, starter, motor mounts, and even a different shape to the hole in the cab floor to allow access to the Hydramatic bellhousing. The whole truck got some pretty radical re-engineering to make the H-M work. The engine and trans were also mated together at the factory to assure proper alignment of the block, bellhousing, and transmission. If you do a swap, change the engine and transmission, and offer the entire Hydramatic engine, trans, and dedicated accessories for sale to someone who wants to keep their truck original.
Jerry
